Engine-controller



M. C. COSGRAY. ENGINE CONTROLLER. APPLICATION FILED JAN. 28,1918.

1,397,503. Patented Nov. 22, 1921..

Pfg. j. Fig. Z.

EN EN.

M. C. COSGBAY. ENGINE CONTROLLER.

APPLICATION FILED JAN. 28, 1918. l 1,397,508. Patented Nov. 22, 1921.

l 3 SHEETSSHEET 2. F1 g j 3 LOAD C URRENT @M/lf@ sraras earanr ortica.

MAB-1E G. @E SNIDSEY, GEIQ?, LSSIGNO'R 'EG MATTHEWS ENGINEER-ini@ GGMPEY, SRDUSEY, OHIO, EGRATION" 0F GEIQ.

ENGIL'E-GGNTROLLEE.

a aereos.

application e anuary it, 191. Serial its. M4533..

7 '0165i who/m t may concern lle it known that l, Mann C. Cosenar, a.' citizen of the United States.a and a resident of ehnnduslry7 in the county of Erie and State o* @hic have invented a1 certain new and useful. Engine-Controller; and .l do hereby declare the following to be a full? clear and exact description ot the invention. suf-.h as will enable others skilled in the art to which it appertains to malte and use the same, reeren ce being had to the accompanying drawings, and to the characters ot reference marked thereoni which form a. part of this specilication. l

My invention relates to means for electrically controlling the output of an engine. particularly has for its object to provide a means which will not only control the speed oi" the engine but also to regulate the supply or fuel to the engine accordingto the load that is placed on the engine.

The invention also has t'or its obiect to provide in a system having an engine driven dynamo and another source of electrical supply7 a means whereby the engine vvill be caused to carry a certain load that may be placed on t e system and prevent the other source of supply from carrying the load until the load maintained by the engine reaches la predetermined amount. The invention is particularly applicable to a system Wherein the current is supplied by a dynamo operated by an engine and by a storage battery.l the storage battery being charged under certain conditions by the dynamo.

The engine regulator may partake of dif--` ferent forms and the details of construction may be greatly varied and yet such modiiications may still contain the invention. lt may also be used in connection with a great variety oic electric systems for regulation of the supply current and other purposes for which theinvention is particularly adapted. l have selected as an illustration'one form of construction containing the invention and shall describe it hereinafter. The construction selected is illustrated in the accompanying drawings. I

Figure l. of the drawing illustrates a front view of the construction selected, the cover of the case in which the construction is inclosed.. beingh shown removed. 2 is an und view of the construction partly in section taken along the lines 2 2 ofl `igi. Fig. il is a side viciv also partly in section taken along the line 3-3 indicated in* Fig.

l'atented Nov. 2%. naar..

2. Fig. is a perspective view showing the adjustable resilient members that control the operation oi one of the elements o1 the construction. Fig. 5 is a diagram of the system containing my invention. diagrammatic illustration of the performance of the regulator in an electric system such as that illustrated in Fig. 5. rig. 7 illust-rates diagrammatically the relative positions of the butterfly valve o1L the engine to the movable elements of the controller.

l, Fig. l is an inclosing shell or case of non-magnetic material, which may be provided witha cover Qfthat is secured by a suitable means on the shell 1.' 3 is a trame which .is pivotally supported in the shell on a pin e that extends through a Wall ot the shell7 and a pin 5 that is located in a bracket 26. An armature d is pivotally supported in the frame 8 for pivotal movements independent oi" the pivotal movement of the frame S. Ylille armature is located in a slot 7 formed in the frame 3 and is lreyed to the pin 4. A magnet 8 having poles 9 and l0 is secured in the Jframe 3. The frame 3 is formed oi suitable non-magnetic material to prevent short-circuiting of the lines of force ot the magnet. The armature 6, when the magnet 8 is energized, moves in a plane extending across the poles or the magnet. The ends of the poles extending towardthe armature terminate in inclined surfaces tcproduce movements of the armature accordf ing to the intensity of the magnetization and to prevent concentration of the magnetization at certain points which would otherwise decrease the responsiveness of the armature. The armature is limited in its movements by a suitable stop such as the pin ll which is secured in one of the poles of the magnet 8. To prevent sticking of the armature, the pin 11 is made of suitable non-magnetic material. To counteract the effect of the magnetization of the magnet 8, a spring l2 is provided which is secured to an arm 13 that prot-rudes from the armature 6 and to a threaded pin la, that is threaded into an ear l5 formed on the frame 3. For securing the threaded member 14 in place, a nut 16 may be threaded onto the threadedl member 14 and screwed against the ear 15. To prevent disproportionate rotation of the armature relative to the polesol" the magnet when the armature approaches the magnet beyond a. certain point, a means is provided so that it Will operate to counteract the elect of magllig.' 6 is aA lGG vand 19 until netization when the armature has rotated beyond a certain degree. This is accomplished by means of a slotted strip 17 through which the arm-13 extends. A spring 19 connects the slotted strip 17 with a threaded pin 20 which also is threaded into the ear 15 and is secured in position by a nut 21. When the armature 6 moves beyond a certain degree in its rotation, the arm 13 strikes the outer end of the slot 22 located in the strip 17 and upon further rotation the armature pulls against the springs 12 the armature 6 strikes the stop 11. J

The frame 3 is also rotated in the shell l by means of a magnet 23 having poles 24 and 25 which extend toward the poles 9 and 10 of the magnet 8. The coacting poles 9, 24 and 10, 25, also terminate in ends having inclined surfaces to permit extended rotation of the frame relative to the distance that the poles move toward each other and also to prevent concentration of magnetism at certain points which would otherwise cause uneven pull between said'poles. The coils 8 and 23 maybe so wound as to produce attraction between the poles or to produce repulsion. 1n the form of the construction shown, the magnets are so wound that attraction is produced between the poles.

e magnet 23 causes rotation of the frame 3 counter to the rotation of the armature 6 produced by the magnet 8. The position of the armature 6 relative to the' frame 3 being determined by the magnet 8 and the springs 12 and 19, the magnet 23 also causes movement of the armature 6 relative to the shell or case 11, in that it moves with frame 3 as a whole. Frame 3 is moved by attraction between poles 24, 9 and 25, 10. The action of the magnet 23 is countered by the spring 27 which is connected to an arm 28 forming a part of the frame 3 and to a threaded pin 29 that is threaded into the case 1. 'A nut 30 may be threaded on to a pin 29 to secure the threaded pin.29 into position. A stop pin 31 may also be threaded in the casing 1 and secured in position by the nut 32. The pin 3l is located in the path of movement of the extension 28 and limits the movement of the frame 3 caused by the spring 27.

1n View of the fact that the magnet 23 by induction modifies the magnetic effect produced between the the armature 6 and to prevent the armature 6 from losing its relative position due to the magnetization of the magnet 8, a second coil 39 (shown in Fig. 5) is .placed on the magnet 8 having the desired number vof turns sulicient'to counteract thel demagnetizing effect of the coil 23 on the armature 6 as described hereinafter. Y

A suitable means may be connectedto the pin 4 for transmitting the movements produced by the armature 6 to an adjust poles of themagnet 8 and able means which controls any device such as to the throttle valve of the gasolene engine. In the form of construction shown, an arm 33 is keyed to the pin 4 and is connected to the throttle valve located in the intake 76 of the gasolene engine by a suitable link 77, as shown diagrammatically in Fi .v 7.

Thg construction illustrated in the figures may be 'connected in a system wherein the translating devices will be supplied by an electric current from a storage battery or from a dynamo, or from both storage battery and dynamo. Suitable controlling devices are also connected in the system for regulating the flow of the current, for selecting the source of supply and for keeping the storagel battery charged.

In Fig. 5 of the drawings is illustrated a system in which the controller illustrated in Figs. 1, 2, 3 and 4 may be used. The engine v42 is mechanically connected by a shaft 43 with the dynamo 40. The dynamo is a shunt wound dynamo and when connected with a storage battery will cause rotation of the shaft 43 and thus give the engine 42 an opportunity to start which when once started, will increase the rotation of the armature of the dynamo 40 and cause it to produce a current in the lines connected therewith. The dynamo 40 is connected to the storage battery 34 and the translating device 41 through the main line 35 von one side and with the storage battery and the translating devices through controlling and regulating means on the other side. The dynamo 40 is connected through the line 44 withy an armature 45 thatis moved in one direction or the other by magnets 46 and 47, to complete a connection through the S'angamo meter 48 with the storage battery 34. The armature 45 completes a connection through a line 49, the Sangamo meter 48 and the line 50. r1`he line 50 is connected with the storage battery 34. Current throug .the lines 49 and3 5() causes rotation of. the switch or contact member 51 ofthe Sangamo meter. The Sangamo meter is provided with contact-points 52 and 53 thatare located in the path of movement of the switch or contact member 5l whereby a circuit may be completed either through'contact 52 or contact 53, from the storage battery 34 to lines 50 and either line 54 or line 55. The line 54 is connected with the magnet 47 whiler the line 55 is connected with `a magnet 46. The magnets 46 and 47 are connected with the storage battery through the line 56 so that the circuit of the storage battery may be completed through the magnet 46 or through the magnet 47 according as the switch member 51 makes contact with either contact 53 or contact 52, respectively. A current through the lines 49 and. 50 causes clock-wise or lll acentos countercloclr-wise rotation of the armature 5l. depending upon the direction oi the current through the lines 49 and 50. When lthe storage battery 54 has discharged a certain number ot its stored coulombs oic electricity, contact will be made between the switch member 5l and the contact member 53 which will complete a bircuit through the storage battery through the magnet 46. rl`his will close the circuit between the lines 44 and 49 through the armature 45 and thus complete a circuit through the field 57 and armature of the dynamo 40 Jfrom the storage battery 34. The dynamo 40 willv operate as a motor to drive the engine 42 whereupon the engine 42 will catch the spark and drive the dynamo 40 to produce a current in they opposite direction and charge the storage battery, the connection being completed through the lines 44, 49, 50, 58 and 35. li the storage battery is charged, the current passing through the Sangamo meter 46 causes clock-wise rotation of the contact or switch arm 51 until contact is made with the contact 52 which will complete the circuit from the battery 50 with the magnet 47 through lines 50 and 54. AThe magnet 47 will pull the armature 45 away from the magnet 46 and break the connection between the lines 44 and 49 and thus break the circuit through the dynamo 40 and the storage battery 34. y

lhe storage battery and the dynamo are also connected with the translating device 41 through controlling devices so thatwhen 'the switches oi the translating devices are fclosed, the current will be supplied by either the storage battery 34 or the dynamo 40 or by both the storage battery and the dynamo depending upon the operations of the controlling devices and the amount of current consumed by thetranslating devices. The storage battery 34 is connected to the translating devices through the line 50, the meter 48, line 49, the solenoid 36, the line 59, lthe coils 38 and 39. The current returns to the storage battery through the line 35. The solenoid 36 is provided with a movable core 61. The weight of the core 6l and the windings oi the solenoid are such that when the current through the solenoid 36 increases to la certain polnt, the core 61 will be lifted and close the contacts 62 which will complete a parallel circuit from the line 59 through the contacts 62, lines 63, 55 and 56 to the lin'e 58. The magnet 46 is located in the parallel circuit and operates the armature 45 to close the circuit of the dynamo through the lines 44, 49 and 50 to the storage battery 45 and line '35 which causes the dynamo to operate asa motor .to start the engine 42. When the engine has been started, the circuit of the dynamo is 'through the lines 44, 49, 64, 59, 60 and 55 'whereby the current i ing devices located between the man lines 6G and 'fiile quantity ot the current supplied iy the dynamo to the translating devices ecause oir the high speed ot' the engine, may be suiiicient to meet the requirements ot' the translating devices and in addition. thereto to charge the storage batteri7 to lreep the storage batterv 34 up to its ruil charge. li, however, the amount consumed by the translating devices is beyond that which may be produced by the dynamo 4C, the storage battery Awhich is connected in a parallel circuit will coperate to supply the additional demand of the 'translating devic if 'for any reason it is desired to turn the load oi' the system :trom the storage battery on to the dynamo before 'the solenoid 36 ol'erates to close the contact 62, it may be then operated by the push button 64 which will cause the dynamo to operate as a motor lto start the engine 42 in the same way that the closing of the contact 62 will start the dynamo 40, since the contact points oit the push button are in parallel relation with the contacts 62 in the circuit.

T he coil 38 oie. engine regulator is connected in series between the translating devices and the circuit closing devices 64 and 62 while 'the coil 66 ot the regulator is connected in a shunt circuit across the terminais of the dynamo. The coil 66 is located on the magnet 8 of the engine regulator while the coil 38 is located on the magnet 23 ot the regulator. The coil 66 of the magnet 6 operates to cause Athe armature 6 to be rotated in one direction, while the coil 38 of the magnet 23 operates to cause the armature 6 to rotate in the opposite direction. llhe butterfly valve to which the arm 53 of the governor lis connected is normally held open by the action oit the spring 12 which pulls the arm i3 `to the end oi the slot formed in the strip 17 to give the engine plenty of gasolene for starting purposes. is the current passes through the coil 66 of the magnet 6, the armature 6 is pulled so as lto reduce the gasolene suppliedv to lthe engine. llhen the voltage is builtup to charging point, the armature 6 is drawn over so as to bring 'the pin 13 against the opposite end of the slot 22 in the strip 17, by the action oi the current passing through the coil 66 which is connected across the terminals ot the dynamo through `the lines 35 and 6'?. lt ier any reason, the line between the generator and battery should become broken the voltage in the shunt wound generator greatly increases whereupon the armature will be strongly attracted by the shunt coil 66, thus closing the throttle ot the engine and preventing the engine Vfrom racing at the saine time, the spring 19 will cooperate with the spring l2 to prevent the armature from being` pulled over so far that the engine would be shut down.-

When the dynamo charges the battery, thev drop 1n voltage ofthe generator reduces the attraction exerted on the armature 6 by the shunt coil 66 so that thev pull of spring 19 is'greater than the attraction of the magnet 8 and the pin 13 pulls back the armature 6 to a will produce a current that will not overheat the battery and which is of a strength that the battery will be charged with reasonable quickness without warping the plates and doing other damages.

Variable currents supplied to the translating devices 41 passing through the series coil 38 of the magnet 23 regulates the position of the armature with reference to the load that isv being carried by the dynamo, inasmuch as the magnetization of the magnet 23 on which the coil 38 is located varies the position of the frame 3 so that thebutterly valve will be opened the greater the load that is placed upon thesystem, that is, thegreater the current passing through the series coil 38.

lin order'to prevent the coil 38 from superinducing a magnetic eil'ect in the poles of the magnet 8, the magnet 8 is also wound with a coil 39 having substantially the same number ofturns as the coil 38 and connected in series with the coil 38 whereby an effect is produced in the magnet 8 that is counter to the effect that may be produced by the `coil 38 on the armature 6.

The ignition means of the engine 42 is also connected wi-th the armature 45 in order that the engine 42 may be stopped after the same has been started. The spark plugs are connected to a Contact Awhich may be closed by a contact which is located on the `armature 45 to which is connected a magneto, or an induction coil and a spark controller which are conventionally indicated at 70. The dynamo continues to run until 'the battery 34 is charged to the full charge so as to bring the contact member. 51 in contact with the contact 52 which establishes a current as heretofore described through the magnet 47. rlhe magnet 47 pulls the armature 45 away from the contact 71 connected with the spark plug 72 through the line 73 to break the ignition circuit whereupon the engine will stop.

The operation of the controller is illustrated diagrammatically in Fig. 6'where the system isdesigned to carry a certain load, particularly what has been termed a one kilowatt size unit or system. The same conditions will exist in connection with systems for carrying other loads except that the proportionate amounts indicated in the diagram will vary and consequently the line indicating the proportions of the current .dynamo had become started position such that the engine supplied to vthe translating devices and to the battery will vary. i

rlhe diagram therefore, is merely illustrative of what is accomplished by the governor Without the governor, the currentto 7 the battery would be abnormal when the or a very light load. This would be when the contact' member 51 had closed the circuit through the contact 53 whereupon the 7 dynamo would supply all |itscurrent to the storage battery. rllhis would cause in connection with the particular -system selected for the purpose of illustration, a current of thirty amperes to be turned on to the battery 8 whichwould overheat the plates and cause them towarp and do great damage in the system, where the load is to be carried by the dynamo up to about thirty two amperes, and the battery of only approximately 8 amperes hour capacity which is standard for a plant of'this'size and operation and furthermore as large as is required on an automatic system of this kind. The diagonal line running from 30 to 42 shown in 9 F ig. 6, indicates the drop in the battery charging current as the load increases until the battery begins to coperate with the dynamo in maintaining the load in systems without the controller. By using the gov- 9 ernor in connection with the system, the dynamo will supply lifteenamperes to the vbattery when operatingunder no load and when the load increases only to ve amperes, the current supplied to the battery will be 1 only about ten amperes which the battery can easily sustain until the plant shuts down. When the load current passes the ten am pere point the coil 38 will operate to control the gas supply to the engine so as to cause 1 the engine to maintain a substantially constant supply of five amperes to the battery besides maintaining the load current. The governor will thus cause the dynamol to maintain the current consumed by the trans- 1 lating devices from the ten ampere point to about twentyse-ven ampere point at the same time allowing only approximately live amperesto How into battery whereupon if the amount of current consumed by the l translating still increases beyond the ap proximate twenty seven ampere point, the amount of current supplied to the battery will decrease until at fullI load on generator itpasses through zero point and the battery 1 under no load i usamos will not be overbeated by the current from the dynamo, garticularly during no'loads or during the period of very light loadsa The governor thus provides a means which enables tbe use of small capacity batteries Where ordinarily very large batteries would be required to prevent early destruction of the battery plates. y

Furthermore, inasmuch as the shunt coil is movably supported with relation to the series coil, and also inasrnuclr as the magnetizing eil'ect of the two coils counteract to operate the shunt coil relative to the lined coil, the armature and the movable coil are disposed in their relation to the series coil according to the Watts that are consumed in the translating devices oi the line. The armature is lirst set with reierence to the shunt coil, according to the current passing to the shunt coil, that is, according` to the potential of the battery, or, generally speelring, oi the line which potentially depends upon the relative condition or voltage of the battery and the generator, and then' the armature and the shunt coil is moved according to the intermagnetic elect of the shunt coil and the series coil. The armature is thus actuated according to the voltage oi the line and is Jfurther actuated to move relative to the shunt coil according to the changes of the voltage o1Q the line and also according to the Watts consumed by the translating devices. i

l claim:

i. ln an electric system, the combination of an engine driven shunt wound dynamo, a storage battery connected to the dynamo, a circuit having translating devices connectn ed to the battery-and the dynamo, means for regulating the speed ci the engine, an electromagnetic means connected to the regulating means and located'in the circuit of the battery and the translating devices and in the circuit of the terminals of dynamo, for keeping a substantiallr constant difference between the voltages of the dynamo andthe battery notwithstanding the changes of the current low in the circuit having the transdevices lating 52. n an electric system, the combination of an engine drivenl shunt Wound dynamo, a

storage battery connected to the dynamo, a circuit having translating devices connected tothe battery and the dynamo, means for regulating the speed of the engine, a pair of magnetic means, one of the magnetic means connected to the regulating means and the other magnetic means for magnetically actuating the first magnetic means, one ol? said magnetic means controlled by the potential of the generator, and the other of the said magnetic means controlled by the current to the translating devices, whereby a substantially constant diderence between the voltages of the battery and the .for moving the frame, the

.coil connected in series dynamo, notwithstanding the load, is maintained.

3. lin an electric system., the combination of an engine drivensliunt Wound dynamo, a storage battery connected to the dynamo, a` circuit having translating devices connected to the battery and. the dynamo, means for regulating thespeed ci the engine, electromagnetic means connected to tlie'regulating means Jor maintaining a constant diilerence between tbe voltages of the dynamo and the battery, a second electro-magnetic means for magnetically actuating the tiret means tor increasing' the speed of the engine as the current tirough translating devices inthe changes ci creases, whereby substantially constant current to the battery is maintained notwithstanding the variationsin the flow o the current to the translating devices.

ln an electric system., thecoinbinatiou of an engine driven shunt Wound dynamo, a storage battery connected. the dynamo, a circuit having translating devices connected to the battery and the dynamo, means lfor regulating the speed. ci the. engine, a movable coil or magnetically actuating the regulating means and connected in shunt across the circuit ofthe battery, tbe dynamo and the translating devices 'io-r maintaining a constant Adiderence between the voltages of the battery and tire-dynamo, second vcoil for magnetically actuating and alfecting the action ci? he iirst coil on the regulating means and connected. in series with the translating devices, whereby a substantially constant current to the battery is maintained notwithstanding the variations o the flow of the current to the translating devices,"

' 5. linv a regulator, the combination of an armature, an electromagnet for operating on the armature, a movable frame for supporting the electromagnet, a second magnet iirst magnet having two coils, one for actuating the armature, the other for counter acting the eliect of the coil of the second magnet on the, armature.

'6. Inl an electric system, the combination of a dynamo and storage battery connected in shunt with the dynamo, translating devices, a controlling device located in the cir cuit ot the translating devices, an internal combustion engine for operating the dynamo and having al valve for regulating the fuel of the engine, an armature for operating the valve, a rotatable coil connected in par- Vallel with the storage battery for operating the armature relative to the coil, a. second with the dynamo and the translating` devices for rotating the irst coil to cause corresponding movement in the armature.

7. ln anelectric system, the combination of translating devices, a storage battery connected to the translating devices, a dynamo l'ating devices,

i combustion armature,

actuating the armature,

for supplying current to the storage battery andthe translating devices, an internal engine for Operating' the dy'- namo and having a valve for regulating the fuel supply to the engine, an armature for operating the valve, a rotatable coil lfdr 'operating the armature relative to the coil and connected in shunt .with'the storage battery, a second coilfo'r rotating the first named coil and connected in series with the dynamo and the translating devices.'

8. In an electric system, the combination of translating devices,.a storage batteryconnected to the translating devices, a dynamo for supplying current to the storage battery and the translating devices, an internalcombustion engine for operatin `the dynamo and having a valve for regulatmg the fuel-supply to the engine, an armature for operating the valve, a rotatable coil ,for operatlng the armature and connected in shunt with the storage battery, a second coil for rotatlng the first named coil and Vconnected, in vseries with the dynamo and the translating devices, a third coil connected in series with the second named coil to counteract vthelmagnetic effect that the second named coil may have on the eii'ect'that the first named coil mayy have on thefarmature.

9. In an electric controlling device, an

a magnet for actuatin the armature, a second magnet for actuatlng the lirst named magnet and the armature.

10.y In an electric .controlling device, a rotatable armature, a rotatable magnet for a. stationary magnet for actuating the rstnamed magnet and the armature. y 1l. In combination with an electric system having a source of current supply and transan electriccontrolling device rotatable armature, a rotatable having a magnet having a coil connected in shunt lWith the source of current supply for actuating the armature, a stationary magnet having a coil connected in series with the source of current supply for actuating the lirst named magnet and the armature.

'12. In combination with an electric system 'comprising an engine driven dynamo, a storage battery, and translating devices, an electric controlling device having lan armature, a coil for actuating the armature, a second coil for actuating the first coil, according to the watts consumed by the translating devices.

13. In combination With an electric sys\ tem comprising an engine driven dynamo, a storage battery and translating devices connected in parallel, an electrlc controlling device having an armature, a coil for actua second coil for furarmature according to by the translating deating the armature, ther actuating the the watts consumed vices.

14.`In combination with an electric sys- `tem comprising an engine driven dynamo, a storage battery, and -translating devices connected in parallel, an electric controlling devicevhaving an armature, means for actuating the armature according to the voltage o'f the source of current supply, and means for modifying the actuation according to the Watts consumed .by thetranslating devices.

15. In combination with an electric sys- ,tem having a source of current supply and translating devices, an electric-controlling device having an armature, a retractile member operating on the armature, a coilV for setting the armature relative to the coil according to the current passing through the coil, a retractile member connected to 4the said coil, means for setting the coil and armature according to the Watts consumed by the translatingdevices.

16. In combination with an electric sys- `tem having a source of current supply and translating devices, an electric controlling device having an armature, a retractilemember operating on the armature, a -coil for setting the armature relative to the coil accordingto the current passing through --the coil, a `retractile member connected to the said coil, a second 4coil for setting the armature and the first coil according to the currents through beth of said coils.

17. In combination with an electric system having a source of currentsupply and translating devices, an electric controlling device having an armature, a retractile member operating on the armature, .a frame connected to the retractile member, a coil for setting the the armature relative to the coil member operating on the said coil and connected to a xed member, a stationary coil for setting the armature and the first named coil according to the currents through both of said coils.- i 18. In combination With an electric system having a source of current supply and translating devices, an electric controlling device having an armature, a retractile meinber operating on the armature, a frame connected to the retractile member, a coil supported on the frame and connected in shunt With the source of current supply for setting the armature relative to the coil and according to the voltage of the line, a retractile member operating on the said coil, a fixed member connected to the retractile member, a stationary coil connected in series with the translating devices and the source of current supply for modifying the position of the armature according to the watts consumed by the translating devices.

In testimony whereof, I have hereunto signed my name to this s eciiication.

` MARKPC. COSGRAY, 

